19-3297; Rev 1; 10/07
KIT
ATION
EVALU
BLE
AVAILA
155Mbps to 3.2Gbps, Low-Power SFP
Limiting Amplifiers
Features
The MAX3747/MAX3747A/MAX3747B multirate limiting
amplifiers function as data quantizers for OC-3 through
OC-48 synchronous optical network (SONET), FibreChannel, and Gigabit Ethernet optical receivers. They are
pin-for-pin compatible with the SY88993V from Micrel
Semiconductor, Inc. The amplifiers accept a wide range of
input voltages and provide constant-level, current-mode
logic (CML) output voltages with controlled edge speeds.
The MAX3747 output voltage level is 500mVP-P and the
MAX3747A/MAX3747B output voltages are 800mVP-P.
The MAX3747B has enhanced LOS operation under overload conditions.
The MAX3747/MAX3747A/MAX3747B limiting amplifiers
feature a programmable loss-of-signal detect (LOS)
and an optional disable function (DISABLE) that can be
combined to implement squelch.
♦ Pin Compatible with Micrel SY88993V
♦ 155Mbps to 3.2Gbps Operation
♦ > 57dB of Gain
♦ < 10-12 BER with 2mVP-P Input Amplitude
♦ 18mA Supply Current
♦ Chatter-Free LOS with Programmable Threshold
♦ Output DISABLE Function
♦ PECL-Compatible Inputs
Ordering Information
TEMP RANGE
PINPACKAGE
PKG
CODE
MAX3747EUB
-40°C to +85°C
10 µMAX
U10C-4
MAX3747AEUB
-40°C to +85°C
10 µMAX
U10C-4
MAX3747BEUB
-40°C to +85°C
10 µMAX
U10C-4
PART
The MAX3747/MAX3747A/MAX3747B are available in a
3mm, 10-pin µMAX® package ideal for small formfactor receivers.
Applications
Gigabit Ethernet SFP/SFF Optical Transceiver Modules
1G/2G Fibre-Channel SFP/SFF Optical Transceiver
Modules
Multirate OC-3 to OC-48 FEC SFP/SFF Optical
Transceiver Modules
10G LX4 Transceiver Modules
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configuration appears at end of data sheet.
Typical Application Circuit
SFP OPTICAL RECEIVER
3-INPUT
DIAGNOSTIC
MONITOR
VCC
DS1859
HOST BOARD
MAX4004
SUPPLY FILTER
HOST FILTER
VCC_RX
VCC
0.1μF
MAX3745
IN+
0.1μF
MAX3747
MAX3747A
MAX3747B
OUT+
IN-
OUT-
0.1μF
50Ω
SERDES
0.1μF
50Ω
5-PIN TO-HEADER
50Ω
VREF
50Ω
TH
GND LOS
DISABLE
4.7kΩ TO 10kΩ
VCC_HOST
LOS
RTH1
0.1μF
0.1μF
RTH2
VCC
RTH1 + RTH2 ≥ 5kΩ
________________________________________________________________ Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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MAX3747/MAX3747A/MAX3747B
General Description
